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Selena Gomez has been in the press since she was a budding tween on the Disney Channel. We've all watched her grow into a smart, talented, business-savvy, and absolutely stunning young woman. But that type of fame comes with unbelievable scrutiny. As she blossomed from a kid into an adult and her figure changed accordingly, Gomez had to deal with body shaming from press, internet trolls, and social media commenters alike.

Rather than give in, feel bad, and let it all affect her, Gomez has often spoken out about learning to love and accept herself—no matter what. To keep the positive vibes going while she travelled the world on her Revival tour, she brought her long-time trainer, fitness expert, and all-around wonderful human Amy Rosoff Davis along with her. We caught up with Davis to find out exactly what the tour has been like, the workouts that keep Gomez looking and feeling amazing, and how to get results quickly at home.

Keep reading for this celebrity trainer's best-kept secrets.

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PHOTO:

Alfy Trill

#1: Build Stamina

"[The best thing to do every day to get in shape is] interval and circuit training—and building a strong core! My whole thing is toning mixed with cardio and stretching. Switching it up helps your muscles stay on their toes. When they don't know what move is coming they work harder. Plus, cardio and toning builds both stamina and strong muscles."

#2 Listen to Your Body

"[My first priority when training Selena is] listening to her body—which everyone should do when it comes to working out. Sometimes we just do yoga and stretching, and sometimes we hit it hard. Working out, just like life, should be a balance."

Part of listening to your body is keeping hydrated. Do it in style with this champagne-inspired water bottle that'll keep your H20 cold for up to 24 hours.

#3 Enjoy Yourself

"[Selena] loves yoga, arm dancing, and Pilates. We like to do lots of butt toning too!"

#4 Mix Up Your Workout

"If you keep your same old routine, you will most likely get bored and wind up skipping the gym. Working out should be a part of your lifestyle, not an obligation or burden. Make your workouts fun by keeping it fresh and doing something different each day. [Selena and I] do everything from Pilates to hiking to dance cardio to circuit training to yoga and spinning—the list goes on. But no matter what the workout, we always make time to stretch. It keeps your muscles long and lean, improves your performance, helps your joints, and enables your muscles to work to their best ability. Also, it feels really good. Keeping fit, eating healthy, and loving yourself are all tied together. When you feel good physically, you want to eat healthy, and when you take good care of yourself you are happy. When you are happy, results come fast!"

Stretch, practice yoga, and do your Pilates workout on this no-slip mat made to protect your joints and cushion any (accidental) falls.

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PHOTO:

Alfy Trill

#5 Don't Weigh Yourself

"I am not a fan of weighing yourself. I think it breeds obsessive thoughts and behaviours. If you work out and eat healthy, your body should do the rest! When you have a healthy mind, body, and soul—the results will come. I prefer the jean test. You know how your pants fit, so go off of that instead of a number. What does it even mean to weigh a certain number, right?"

#6 Be Flexible

"The workouts [on the Revival tour] change daily on purpose. But I always incorporate some yoga and stretching into my day. I try and aim for 30 minutes of cardio at least four to six times a week. I do toning and stretching about six days a week. Sometimes my schedule only allows for 20 minutes, but my whole motto is to be flexible with your life and your workout. Obsession never got anyone anywhere, so I don't put pressure on myself to stick to a certain workout schedule. I am so active in general, and I work out with clients so much that I get plenty of physical activity every day. On tour, people joke that I move and walk faster than anyone else. I am always speeding around through the venue."

#7 Listen to Music You Love

"[My workout playlist consists of] 'Cheap Thrills' by Sia, 'Controlla' by Drake, 'Don't Let Me Down' by The Chainsmokers, 'Past Lives' by Børns, 'It Is What It Is' by Blood Orange, and 'This Is What You Came For' by Calvin Harris."